Abrading and polishing tool



Aug. 6, 1929. sw 1,723,821

. ABHADING AND POLISHING TOOL Filed Nov. 25, 1925 2 Sheets-Sheet l HOFOICI- Swan, 31412214 600 Witnesses E2 Patented Aug. 6, 1929.

PATENT OFFICE.

HAROLD A. SWAN, OF CORONADO, CALIFORNIA.

ABRADING AND Application filed November This invention relates to certain new and useful improvements in abrading or polishing tools, and has more particular reference to tools of the above kind of relatively small size and light construction adapted to be readily carried in the hand and manually pushed over the surface to be abraded or polished.

The primary object of the invention is to provide an abrading or polishing tool of the above kind embodying a single abrading or polishing drum as well as embracing a construction which is simple and durable in form. and effective in operation.

A further object of the invention is to provide simple and effective means for raising and lowering the abrading or polishing drum whereby the latter may be brought to bear upon the surface to be abraded or polished with the required pressure or disengaged from such surface, as desired.

Still another object of the invention is to embody a motor for driving the abrading or polishing drum in the tool. structure so that a compact construction is bad, and to provide a gearing for operatively connecting the motor to the drum, which gearing is in the nature of a reduction gearing for permitting the use of a relatively small motor capable of being housed within the drum and having an armature adapted to rotate at a relatively high speed for insuring sufficient power to cause rotation. of the drum at a relatively lower speed even though resistance to rotation of the drum is experienced by reason of engagement of the drum with the surface to be abraded or polished.

A still further object of the invention is to make thoroughly practical provision for mounting of the motor within the abrading or polishing drum and for operatively connecting the armature shaft of the motor with the drum.

A still further object of the invention is to provide a tool of the above kind embodying a casing for enclosing the major portion of the polishing or abrading drum, and wherein said casing is constructed with a coversection adapted for removal or to be opened whereby the abrading or polishing drum together with its enclosed motor and gearing may be removed from the casing, as unit, for renewal or repair pu poses.

POLISHING TOOL.

23, 1925. Serial No. 71,006.

Other objects will appear as the nature of the invention is better understood, and the same consists in the novel form, combination and arrangement of parts hereinafter more fully described shown in the accompanying drawing and claimed.

In the drawings, where in like reference characters indicate corresponding parts throughout the several views- Figure 1 is a side elevational view of an abrading or polishing tool constructed in accordance with the present invention;

Figure 2 is a vertical longitudinal sectional view thereof;

Figure 3 is a horizontal longitudinal sectional view of the same;

Figure l is a transverse sectional view of the device shown in Figure 1; and

Figure 5 is an enlarged edge elevational view of one of the eccentric rings forming part of the means for raising and lowering the polishing drum.

Referring more in detail to the drawings, the present invention embodies a stock plate 5 provided with a flat under surface adapted to flatly engage the surface to be abraded or polished, and this stock plate is provided near its forward end with a relatively wide transverse slot 6, the ends of which are extended upwardly a slight distance in the side or longitudinal flanges 7 rigidly provided on the plate 5 as shown. The flanges 7 are connected by a pair of transverse arcuate walls or webs 8 which are arranged at the front and rear sides of the slot 6 and cooperate with the portions of the flanges 7 therebetween to form the lower section of a casing so that said lower section is rigid with the stock plate 5. The casing is of cylindrical form and embodies a separate upper or cover section- 9 which may be removable, but which is preferably hinged at its forward side as at 10 to the upper edge portion of the forward arcuate wall 8. The upper or cover section 9 of the casing is thus capable of being swung upwardly and forwardly to open position for a purpose which will later become apparent, and rigidly formed. upon the upper edge portion of .the rear curved wall 8 and the rear edge of the cover section 9 are cooperating lugs 11 and 12 with which are associated mans for retaining the cover section 9 closed. This means may embody bolts 13 i to open position.

hinged to the lugs 11 of the rear wall 8 and. adapted to be swung into or out of slots provided in the lugs 12 carried by the cover section 9, suitable wing nuts 13 being threaded upon the free ends of the bolts 13 and adapted to bear against the upper surfaces of the lugs 12 for retaining the cover section 9 tightly closed. Obviously, by loosening the wing nuts 14, the bolts 13 may be swung rearwardly and downwardly out of the slots of the lugs 12 so that the cover section 9 is released and may then be swung upwardly and forwardly The above construction provides a horizontal transverse cylindrica casing having flat circular side or end walls, and these side or end walls are formed with central relatively large circular openings in which rotatable cam rings 15 are journaled.

The casing is formed with outwardly projecting annular flanges 16 about these openings, which flanges are internally rabbeted at their outer ends, and formed upon the outer ends of the eccentric rings '15 are external annular flanges 17 adapted to fit in the grooves or rabbets of the flanges 16 for limiting inward movement of the eccentric rings '15 relative to the casing or preventing accidental displacement of such eccentric rings inwardly through the openings of the casing as will be apparent from Figures 3 and 4. v

Disposed within the casing is an electric motor 18 of the well known conventional type embodying a rotatable armature fixed to an armatureshaft 19 and surrounded by a stationary field carried by a casing 20 in which the armature shaft 19 is journaled by the use of suit-able bearings as indicated at 21.

The eccen ric rings 15 are rotatably fitted on supporting disks 22 one of which is provided with perforations as at 23 for a purpose, which will later become apparent, and

which is rigidly attached to the frame 20 of the motor by suitable means such as screws 2-1 which pass through openings in this disk 22 and are threaded into sockets of the motor casing 20 as shown more clearly in Fig ure 3.

p The motor 18 centrally disposed within an abrading or polishing roller-'25 which also concentric with and disposed within the casing'of the, stock plate 5, and this abrading or polishing drum has an end wall 26 formed with a central opening into which a cylin drical portion of the motor casing 20 projects, a suitable anti friction bearing 27 being interposed between this wall 26 and the casing 20 for permitting the drum to freely rotate relative to the motor at this point. The

abrading or-polishing drum further includes another end or side wall 28 which has a central opening of such large size that the wall 28 is substantially in the nature of ring. A

other supporting disk 22 by means of screws 30 or the like. An anti-jlriction bearing 31 is provided between the spider or disk 29 and the end wall 28 so that the drum is supported at this end for free rotation relative to the spider or disk 29, and (he armature shaft 19 projects into a socket in the center of the spider or disk 29 as indicated at 2313. An anti-friction bearing 33 is provided between the spider or disk 29 and the free end of the arirniture she l t 19 so that the armature shaft may freely rotate without lending to cause rotation of the spider or disk 25).

Secured upon the projecting end portion of the armature shaft 19 is a spur pinion Ell which meshes with a pair of relatively large spur gee s 35 that are journaled upon suitable stub shafts which are carried by and project laterally inwardly from the spider or disk 29 at opposite sides of the pin-ion 31. The gears 35 mesh with an internal ring gear as which surrounds said gears 35 and is secured in a suitable manner to and wit-bin the adjacent end of the drum It is thus apparent that when the motor 18 is placed into operation so as to cause rotation of the armature shaft 19. the rotation of said armature shall. is transmitted to the drum 25 through the gcaring described and the motor is e'l'l'ecti-vely supported so that the drum may :l'reely rotate about the same.

The eccentric rings 15 may be provided with pairs of diametrically opposed studs or pins 37 which project outwardly, and disposed to straddle the casing is a bail or U-shaped lever 38, the ends of which are provided with pairs o l openings adapted for detachable reception of the studs onpins 37. The bail or lever 38 is preferably constructed of resilient sheet metal so that the legs thereof may be spread apart for disengaging from the studs or pins 3? whereby removal of the lever or'hail 38 is permitted for allowing the upper casing section 9 to be opened. By swinging the le 38 the eccentric rings 15 may be rotated about the disks 22 and relutive to the casing so as to etlcct raising or lowering of the drum 2?) and parts carried thereby,dep(n1diu;5 upon the direction in which the lever 38 is swung. ltis thus apparent that the surface of the abrndirrg: or polishing drum may be brought into or out of contact with the surface to be abraded or polished upon which the plate 5 rests and that the jn'essure with which the drum engages said surface may be regulated. Any suitable means may be provided to hold the lever 38 in adjusted position such as an inwardly projecting lug on the intermediate portion of the lever 38 adapted to engage in notches 39 provided in the outer surface of the cover section 9. The lever 38 may also be provided with any suitable form of handle for facilitating; swinging ofthe same if found necessary or desirable.

A conduit or rigid pipe 40 is horizontally Ill) disposed at one side of the casing with its forward end projecting through and fitted in an opening of the adjacent flange 16 and extending through a circumferentially elongated slot 41 in the adjacent eccentric ring 15 (see Figure 5), whereby rotation of said eccentric ring is permitted. The forward end of the conduit 40 is threaded into an opening in the adjacent apertured disk 22, and it is thus ap parent that the disk 22 having the apertures 23 is restrained from rotation relative to the casing by means of the conduit 40 so that tendency of the motor casing and the spider 29 to rotate is overcome. The conduit 40 projects reariwirdly to the rear side of the casing oi the plate 5 where it has a suitable electric switch 42 fixed thereto to which leads a suitable attachment cord 43 whose free end may be equipped with an attachment plug for facilitating connection of the tool motor with a suitable source of electricity'such as an at tachment plug socket of a house wiring system. The current is supplied from the switch 42 to the motor 18 by means of a cable which passes through the conduit 40 and then through one of the apertures 23 of the adj acent disk 22, into the motor casing 20 as shown in Figure 3. The switch 42 is thus mounted in convenient position to render the motor 18 operative or inoperative at will. The opening in the flange 16 through which the conduit 40 passes is closed by the adjacent lower edge of the adjacent side wall of the cover section 9 so that when said cover section 9 is opened, the conduit 40 may be removed with the eccentric rings, disk 22 and the motor carrying abrading or polishing roller 25 from the lower rigid section of the tool casing.

A suitable diaphragm 44 may be suitably mounted within the drum 25 adjacent to and at the inner side of the gears 35 and pinions 34 for retaining oil in the several adjacent bear ings, and act as an oil guard for the adjacent surface of the motor. Suitably fixed upon the rear portion of the stock plates 5 at the rear side of the casing of the latter is a handle 45 for facilitating pushing of the tool over the surface to be abraded or polished. The handle 45 is disposed centrally between the flanges 7, and in order to facilitate forcible engagement ot the plate 5 and the drum 25 with the surface to be abraded or polished with the required pressure, a further bail handle 46 may be fixed to the rigid lower section of the drum casing with its ends secured to the sides of the latter as shown clearly in Figure 1. The eccentric rings 15 may be provided at their inner ends with internal annular flanges as at 47 against which the inner ends of the disks 22 are positioned and secured by the screws 24 and 30, whereby accidental outward displacement of the eccentric rings is prevented.

rom the foregoing description it will be seen that the present invention e iminates the necessity for external gearing to drive the drum and the reduction gearing between the motor and the drum enables driving of the drum with sufiicient power and at a relatively low speed by the use of a relatively small high speed motor which is compactly arranged relative to the drum for econoi'nizing space and making the entire tool construction quite compact.

In operation the switch 42 is turned on for causing. the motor 18 .to operate, whereupon the drum 25 is rotated through the gearing described. The tool is then placed upon the surface to be abraded or polished and manually pushed thereon as is obvious to those skilled in the art.

The abrading or polishing drum preferably consists of a cylinder onto which are fitted concentric bands 48 and 49, the band 48 being of rubber or other suitable material and the band 49 being of sand paper of other abrading or polishing material depending upon the work to be done. The band 48 is preferably of rubber for furnishing a yielding padding between the polishing or abrading band 49 and the drum proper and at the same time preventing slipping of the band 49 eircumferentially of the drum proper.

The ring gear 36 and drum wall 28 are provided with transverse alined openings as at 48 which are arranged in a circular series, and fixed to the inner side of the ring gear 36 at the inner ends of such openings are dished fan blades 49. Thus, when the drum 25 is rotated the blades 49 are carried around so as to draw air into the drum through the openings 23 of the left hand disk 22 and then force the air out of the drum through the openings 48 into the drum casing. This keeps themotor and bearings cool, and the air is discharged from the drum casing through the slot 6 so as to blow loose particles from the surface being abraded or polished.

for keeping the latter clean and cool.

Minor changes may be made without de' parting from the spirit and scope of the invention as claimed.

hat I claim asnew is 1. An abrading and. polishing tool comprising a casing, polishing mechanism arranged therein, said casing being provided with an arcuate series of notches, eccentric devices interposed between said mechanism and said casing for supporting the mechanism for rotation and a bail passing around the casing and having its extremities connected to said devices for adjusting the same and adapted to have detachable engagement with any one of said notches.

2. An abrading and polishing tool including adjustably mounted and relatively spaced eccentric rings, supporting discs arranged in the rings, a motor arranged between the sup porting discs and secured to one of them, a spider secured to the other supporting discbetween the same and motor an abrading and polishing drum surrounding the motor and rotatably supported by the same and the spider, a pinion fixed to the shaft of the motor, gears journnled on the spider and meshing with the pinion, and a gear fixed to the drum nndmeshing with said first gears.

8. An abrading and polishing tool including eccentric rings arranged in relatively spaced relation and adjustably mounted, supporting discs arranged in the rings, a motor arranged between the supporting discs and secured to one of them, a spider secured to the other supporting disc between the some and the motor, an abrading and polishing drum surrounding the motor and spider and rotatztbly supported by said parts, and means establishing a driving connection between the motor and drum.

In testimony whereof I ztfiix my signature.

HAROLD A. SWAN. 

